Low-voltage cabinet copper bar air cooling control circuit

Abstract

The utility model belongs to the technical field of power distribution equipment, and discloses a low-voltage cabinet copper bar air cooling control circuit, which comprises a fan, a temperature switch module and an electromagnetic current relay, and is characterized in that the electromagnetic current relay comprises a first relay contact and a first coil; one end of the fan is connected with a live wire end of a power supply circuit, and the other end of the fan is respectively connected with the temperature switch module and a first relay contact of the electromagnetic current relay; the other end of the temperature switch module is respectively connected with the zero line end of the power supply circuit and the other end of the first relay contact, and the temperature switch module is used for monitoring the temperature of a copper bar of a low-voltage cabinet of the power distribution equipment; the first coil of the electromagnetic current relay is connected with a current measurement main loop of the low-voltage cabinet. The utility model aims to reduce the temperature of the copper bar of the low-voltage cabinet and improve the operation safety of an electric power system.

Description

Technical Field

[0001] This utility model relates to the field of power distribution equipment technology, and in particular to a low-voltage switchgear copper busbar air-cooling control circuit. Background Technology

[0002] In the low-voltage distribution segment of the power system, the low-voltage switchgear is the core equipment for realizing power distribution and control. Its stable operation is crucial to the reliability of the entire power network. The copper busbar, as the key conductive component inside the low-voltage switchgear that undertakes power transmission, generates heat due to resistance loss when current passes through it. Therefore, the heat dissipation of the copper busbar affects the safety and stability of the power system operation.

[0003] Currently, the common solution for air-cooled copper busbar control in low-voltage switchgear is to use a temperature controller to control the start and stop of the fan. This control solution has significant limitations. On the one hand, the normal operation of the temperature controller depends entirely on its own power supply. In practical applications, problems such as power failure and voltage fluctuations may occur. Once the controller power supply is abnormal, the temperature controller will be unable to accurately monitor the temperature and control the fan start and stop, resulting in untimely heat dissipation of the copper busbar and greatly reducing the reliability of the system. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a low-voltage switchgear copper busbar air-cooling control circuit, including: a fan, a temperature switch module, and an electromagnetic current relay, wherein the electromagnetic current relay includes a first relay contact and a first coil;

[0005] One end of the fan is connected to the live wire of the power supply circuit, and the other end of the fan is connected to the temperature switch module and the first relay contact of the electromagnetic current relay. The other end of the temperature switch module is connected to the neutral wire of the power supply circuit and the other end of the first relay contact. The temperature switch module is used to monitor the temperature of the copper busbar of the low-voltage cabinet of the power distribution equipment.

[0006] The first coil of the electromagnetic current relay is connected to the current measurement main circuit of the low-voltage cabinet.

[0007] In some embodiments, the low-voltage switchgear copper busbar air-cooling control circuit further includes a circuit breaker, and one end of the fan is connected to the live wire end of the power supply circuit through the circuit breaker.

[0008] In some embodiments, the circuit breaker is provided with an electric operating mechanism, and the circuit breaker is connected to an external remote control module through the electric operating mechanism.

[0009] In some embodiments, the temperature switch module includes a first temperature switch, one end of which is connected to the other end of the fan and the first relay contact, and the other end of which is connected to the neutral wire and the other end of the first relay contact.

[0010] In some embodiments, the temperature switch module includes a second temperature switch and a third temperature switch. One end of the second temperature switch is connected to the other end of the fan and the first relay contact, respectively. The other end of the second temperature switch is connected to the third temperature switch, and the other end of the third temperature switch is connected to the neutral wire terminal and the other end of the first relay contact, respectively.

[0011] In some embodiments, the contacts of the temperature switch in the temperature switch module are normally open contacts.

[0012] In some embodiments, the temperature switch in the temperature switch module is configured as one or more of the following: flat-angle movable ring, flat-angle fixed ring, bent-angle movable ring, bent-angle fixed ring, metal rod manual reset, plastic rod manual reset, round head thread, hexagonal thread, waterproof tape, double-pole four-pin, double-maximum power, and high current styles.

[0013] In some embodiments, the housing of the temperature switch in the temperature switch module is made of one or more of the following materials: bakelite, ceramic, metal, and plastic.

[0014] In some embodiments, the first relay contact is a normally open contact.

[0015] In some embodiments, the low-voltage switchgear copper busbar air-cooling control circuit further includes an intermediate relay and an LED indicator light. The intermediate relay includes a second relay contact and a second coil. The other end of the temperature switch module and the other end of the first relay contact are both connected to the second coil. The other end of the second coil is connected to the neutral wire terminal. The second relay contact is connected to the LED indicator light.

[0016] The beneficial effects of this utility model are as follows: The design includes a fan, a temperature switch module, and an electromagnetic current relay for air cooling control. The temperature switch module and the electromagnetic current relay are connected in parallel. The temperature switch module monitors the temperature of the copper busbars in the low-voltage switchgear of the power distribution equipment, controlling the fan's start and stop from a temperature perspective. The electromagnetic current relay's first coil monitors the current in the main circuit, controlling the fan's start and stop from a current perspective. This achieves coordinated control of the fan by the temperature switch and the electromagnetic current relay, effectively reducing the temperature of the copper busbars in the low-voltage switchgear. Furthermore, based on this air cooling control circuit, a passive temperature switch can be used for the temperature switch module, avoiding the limitations of the controller power supply in temperature controllers and improving the safety of power system operation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of a low-voltage switchgear copper busbar air-cooling control circuit according to the first embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a low-voltage switchgear copper busbar air-cooling control circuit according to the second embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a low-voltage switchgear copper busbar air-cooling control circuit according to the third embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of a low-voltage switchgear copper busbar air-cooling control circuit according to the fourth embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of a low-voltage switchgear copper busbar air-cooling control circuit according to the fifth embodiment of this utility model. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the existing technology, in the low-voltage distribution link of the power system, the low-voltage switchgear is the core equipment for realizing power distribution and control. Its stable operation is crucial to the reliability of the entire power network. The copper busbar, as the key conductive component inside the low-voltage switchgear that undertakes power transmission, will generate heat due to resistance loss when current passes through it. Therefore, the heat dissipation of the copper busbar affects the safety and stability of the power system operation.

[0025] Currently, the common solution for air-cooled copper busbar control in low-voltage switchgear is to use a temperature controller to control the start and stop of the fan. This control solution has significant limitations. On the one hand, the normal operation of the temperature controller depends entirely on its own power supply. In practical applications, problems such as power failure and voltage fluctuations may occur. Once the controller power supply is abnormal, the temperature controller will be unable to accurately monitor the temperature and control the fan start and stop, resulting in untimely heat dissipation of the copper busbar and greatly reducing the reliability of the system.

[0026] In view of this, this application provides a low-voltage switchgear copper busbar air-cooling control circuit. Figure 1 This is a schematic diagram of the structure of a low-voltage switchgear copper busbar air-cooling control circuit provided in an embodiment of this application. Figure 1 The low-voltage switchgear copper busbar air-cooled control circuit may include, but is not limited to: fan M, temperature switch module and electromagnetic current relay, the electromagnetic current relay including first relay contact KA and first coil;

[0027] One end of the fan M is connected to the live wire of the power supply circuit, and the other end of the fan M is connected to the temperature switch module and the first relay contact KA of the electromagnetic current relay. The other end of the temperature switch module is connected to the neutral wire of the power supply circuit and the other end of the first relay contact KA. The temperature switch module is used to monitor the temperature of the copper busbar of the low-voltage cabinet of the power distribution equipment.

[0028] The first coil of the electromagnetic current relay is connected to the main current measurement circuit of the low-voltage cabinet.

[0029] Specifically, the embodiments of this application address the heat dissipation problem of copper busbars in low-voltage cabinets of power distribution equipment. The fan M can be configured to face or turn away from the copper busbar, which can induce airflow in the vicinity of the fan M and the copper busbar to form an air duct, thereby removing the heat from the copper busbar and achieving cooling of the copper busbar.

[0030] The temperature switch module is equipped with a temperature switch, which is a passive switch. Its temperature sensing element is set on the copper busbar to monitor the temperature of the copper busbar. When the temperature change exceeds the set critical temperature, it will trigger the contact to open or close. Taking the bimetallic strip temperature switch as an example, it is made of two metal strips with different coefficients of thermal expansion bonded together. When the temperature changes, the bimetallic strip bends and will trigger the contact to open or close at the critical temperature.

[0031] An electromagnetic current relay is an electronic control device, generally divided into an input circuit and an output circuit. Based on the input signal from the input circuit, it controls the output circuit. In this embodiment, the first coil represents the device connected to the input circuit, and the first relay contact KA represents the device connected to the output circuit. The first coil is connected to the main current measurement circuit of the low-voltage switchgear to monitor the main circuit current. When the detected main circuit current exceeds the preset operating threshold of the electromagnetic current relay, it triggers the opening and closing of the first relay contact KA.

[0032] Based on the aforementioned fan M, temperature switch module, and electromagnetic current relay, electrical energy is input through the live wire of the power supply. After passing through fan M, it splits into two branches: one connected in parallel to the temperature switch module and the other to the first relay contact KA. The electrical energy then rejoins in the two branches and flows to the neutral wire of the power supply circuit. Therefore, both the temperature switch module and the first relay contact KA can control the circuit's on / off state. Furthermore, the closure of either the temperature switch module or the first relay contact KA will enable the circuit to conduct, thereby controlling the fan M to start and dissipate heat from the copper busbar.

[0033] Figure 1 The circuit connection method of the fan M and the temperature switch module is only shown, without specifying the specific spatial connection relationship between them and the copper busbar.

[0034] This embodiment designs an air-cooled control circuit including a fan M, a temperature switch module, and an electromagnetic current relay. The temperature switch module and the electromagnetic current relay are connected in parallel. The temperature switch module monitors the temperature of the copper busbars in the low-voltage switchgear of the power distribution equipment, controlling the start and stop of the fan M from the temperature perspective. The first coil of the electromagnetic current relay monitors the current of the main circuit, controlling the start and stop of the fan M from the current perspective. This achieves coordinated control of the fan M by the temperature switch and the electromagnetic current relay, effectively reducing the temperature of the copper busbars in the low-voltage switchgear. Furthermore, based on this air-cooled control circuit, a passive temperature switch can be selected for the temperature switch module, avoiding the limitations of the controller power supply of the temperature controller and improving the safety of power system operation.

[0035] In some embodiments, the low-voltage switchgear copper busbar air-cooled control circuit also includes a circuit breaker QF, and one end of the fan M is connected to the live wire end of the power supply circuit through the circuit breaker QF.

[0036] In this embodiment, a circuit breaker QF is added to the low-voltage switchgear copper busbar air-cooling control circuit. A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. (Refer to...) Figure 2 , Figure 2 This is a schematic diagram of the low-voltage switchgear copper busbar air-cooled control circuit after adding circuit breaker QF. The fan M is connected to the live wire terminal of the power supply circuit through circuit breaker QF.

[0037] The circuit breaker QF can protect the power supply circuit, fan M, temperature switch module and other devices. When an overload, short circuit or undervoltage fault occurs in the circuit, it can automatically disconnect the circuit and improve the safety of the low voltage cabinet copper busbar air-cooled control circuit.

[0038] In some embodiments, the circuit breaker QF is provided with an electric operating mechanism, which is connected to an external remote control module.

[0039] The electric operating mechanism is a component of the circuit breaker. It can be driven by an external power supply and controls the opening or closing of the circuit breaker according to external signals. In this embodiment, the electric operating mechanism is connected to an external remote control module. The remote control module can be a control panel of a wired power distribution device or a remote terminal device with a wireless connection. The electric operating mechanism obtains the external signal from the remote control module and controls the opening or closing of the circuit breaker QF according to the external signal, thereby realizing remote control of the low-voltage switchgear copper busbar air-cooling control circuit and improving the flexibility of system heat dissipation control.

[0040] In some embodiments, the temperature switch module includes a first temperature switch KSD1, one end of which is connected to the other end of the fan M and the first relay contact KA, and the other end of which is connected to the neutral wire and the other end of the first relay contact KA.

[0041] In this embodiment, the temperature switch module is configured to include a temperature switch, which is defined as the first temperature switch KSD1, referencing... Figure 3 The first temperature switch KSD1 is connected in parallel with the first relay contact KA and can control the on / off state of the circuit where the fan M is located.

[0042] In some embodiments, the temperature switch module includes a second temperature switch KSD2 and a third temperature switch KSD3. One end of the second temperature switch KSD2 is connected to the other end of the fan M and the first relay contact KA, respectively. The other end of the second temperature switch KSD2 is connected to the third temperature switch KSD3, and the other end of the third temperature switch KSD3 is connected to the neutral wire terminal and the other end of the first relay contact KA, respectively.

[0043] In this embodiment, the temperature switch module is configured to include two temperature switches, which are defined as the second temperature switch KSD2 and the third temperature switch KSD3, as shown in the reference. Figure 4 The second temperature switch KSD2 and the third temperature switch KSD3 are connected in series, and this series circuit is then connected in parallel with the first relay contact KA. Unlike the previous embodiment where the first temperature switch KSD1 can control the on / off state of the circuit where the fan M is located, in this embodiment, the second temperature switch KSD2 and the third temperature switch KSD3 work together to control the on / off state of the circuit where the fan M is located. The second temperature switch KSD2 and the third temperature switch KSD3 are selected from the same model, so that their critical temperature and other parameters are the same. When the temperature changes, both temperature switches need to be triggered to determine that the temperature has exceeded the critical temperature. This prevents the failure of any temperature switch from causing missed or false alarms, achieves cross-verification, and improves the reliability of the air-cooling control.

[0044] In other embodiments, the temperature switch module may further include a temperature switch array integrating multiple temperature switches, wherein each temperature switch may be set at a different position on the copper busbar to comprehensively monitor the temperature of the copper busbar and control the on / off state of the circuit where the fan M is located through the temperature switch array, thereby further improving the reliability of the air cooling control.

[0045] In some embodiments, the contacts of the temperature switch in the temperature switch module are normally open contacts.

[0046] Optionally, the temperature switches in the temperature switch modules such as the first temperature switch KSD1, the second temperature switch KSD2, and the third temperature switch KSD3 described in the above embodiments are all configured with normally open contacts. That is, when the copper busbar temperature does not exceed the critical temperature, the contacts are open and the fan M does not start. When the copper busbar temperature exceeds the critical temperature, the contacts are closed and the fan M starts, thereby enabling the fan M to be started to dissipate heat from the copper busbar when the temperature is too high, thus improving the safety of the power system operation.

[0047] In some embodiments, the temperature switch in the temperature switch module is configured as one or more of the following: flat-angle movable ring, flat-angle fixed ring, bent-angle movable ring, bent-angle fixed ring, metal rod manual reset, plastic rod manual reset, round head thread, hexagonal thread, waterproof tape, double-pole four-pin, double-maximum power, and high current styles.

[0048] To address the complex demands of on-site environments, the temperature switch in the temperature switch module can be selected from one or more of the aforementioned styles based on actual needs. For example, there are flat-angle or bent-angle styles for installation on flat or curved surfaces; fixed-ring or movable-ring styles for those requiring post-installation adjustment; plastic or metal reset rods for those requiring mechanical strength; round-head or hexagonal-thread styles for those requiring tightening force; waterproof-lined styles for those requiring waterproofing; and dual-pole four-pin, dual-high-power, or high-current styles for those requiring power or current carrying capacity. Selecting a matching temperature switch style based on the actual needs of the on-site environment improves the reliability of the temperature switch module.

[0049] In some embodiments, the housing of the temperature switch in the temperature switch module is made of one or more of the following materials: bakelite, ceramic, metal, and plastic.

[0050] Furthermore, the on-site environment may also have certain requirements for the housing material of the temperature switch. For example, stainless steel is a metal material that can withstand high temperatures, while plastic has good insulation properties. Depending on the on-site requirements, one or more materials such as bakelite, ceramic, metal, plastic, or other materials can be selected to make the housing of the temperature switch, thereby improving the reliability of the temperature switch module.

[0051] In some embodiments, the first relay contact KA is a normally open contact.

[0052] On the other hand, the first relay contact KA of the electromagnetic current relay is set as a normally open contact. That is, in the main circuit of the low-voltage switchgear, when the main circuit current does not exceed the preset operating threshold of the electromagnetic current relay, the first relay contact KA is open and the fan M does not start. When the main circuit current exceeds the operating threshold, the contact closes and the fan M starts. This enables the fan M to start when the main circuit current is too high, so as to dissipate heat from the copper busbar under high load scenarios and improve the safety of power system operation.

[0053] In some embodiments, the low-voltage switchgear copper busbar air-cooling control circuit further includes an intermediate relay and an LED indicator light. The intermediate relay includes a second relay contact and a second coil J. The other end of the temperature switch module and the other end of the first relay contact KA are both connected to the second coil J. The other end of the second coil J is connected to the neutral wire. The second relay contact is connected to the LED indicator light.

[0054] In this embodiment, an intermediate relay and an LED indicator light can also be added to the air-cooling control circuit. The intermediate relay provides more contacts for transmitting signals and simultaneously controlling multiple circuits. (See reference...) Figure 5 After the branch circuit of the temperature switch module and the branch circuit of the electromagnetic current relay merge, they are connected to the neutral terminal through the second coil J. The contacts of the intermediate relay are connected to another circuit, in which they are connected to the LED indicator light. This allows the LED indicator light to be turned on or off based on the on / off state of the air-cooling control circuit. When both the temperature switch contacts and the first relay contact KA are open, and the fan M is not running, the second coil J is also not energized, and the LED indicator light is off. When either the temperature switch contact or the first relay contact KA is closed, and the fan M starts, the second coil J is energized, and the LED indicator light illuminates. This provides a remote indication of whether the fan M is running, facilitating monitoring by staff to understand the operating status of the power system.

[0055] It should be noted that the above-mentioned embodiments with added circuit breaker QF, temperature switch module, and intermediate relay and LED indicator light can be combined to comprehensively improve the effect of air-cooled control circuit.

[0056] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0058] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0059] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A low-voltage switchgear copper busbar air-cooling control circuit, characterized in that, The low-voltage switchgear copper busbar air-cooling control circuit includes: a fan, a temperature switch module and an electromagnetic current relay, wherein the electromagnetic current relay includes a first relay contact and a first coil; One end of the fan is connected to the live wire of the power supply circuit, and the other end of the fan is connected to the temperature switch module and the first relay contact of the electromagnetic current relay. The other end of the temperature switch module is connected to the neutral wire of the power supply circuit and the other end of the first relay contact. The temperature switch module is used to monitor the temperature of the copper busbar of the low-voltage cabinet of the power distribution equipment. The first coil of the electromagnetic current relay is connected to the current measurement main circuit of the low-voltage cabinet.

2. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 1, characterized in that, The low-voltage switchgear copper busbar air-cooling control circuit also includes a circuit breaker, and one end of the fan is connected to the live wire end of the power supply circuit through the circuit breaker.

3. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 2, characterized in that, The circuit breaker is equipped with an electric operating mechanism, and the circuit breaker is connected to an external remote control module through the electric operating mechanism.

4. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 1, characterized in that, The temperature switch module includes a first temperature switch, one end of which is connected to the other end of the fan and the first relay contact, and the other end of which is connected to the neutral wire and the other end of the first relay contact.

5. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 1, characterized in that, The temperature switch module includes a second temperature switch and a third temperature switch. One end of the second temperature switch is connected to the other end of the fan and the first relay contact, respectively. The other end of the second temperature switch is connected to the third temperature switch, and the other end of the third temperature switch is connected to the neutral wire terminal and the other end of the first relay contact, respectively.

6. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 3 or 4, characterized in that, The temperature switch in the temperature switch module has normally open contacts.

7. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 3 or 4, characterized in that, The temperature switch in the temperature switch module is configured with one or more of the following styles: flat-angle movable ring, flat-angle fixed ring, bent-angle movable ring, bent-angle fixed ring, metal rod manual reset, plastic rod manual reset, round head thread, hexagonal thread, waterproof with wire, double-pole four-pin, double-maximum power and high current.

8. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 3 or 4, characterized in that, The housing of the temperature switch in the temperature switch module is made of one or more of the following materials: bakelite, ceramic, metal, and plastic.

9. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 1, characterized in that, The first relay contact is a normally open contact.

10. The low-voltage switchgear copper busbar air-cooling control circuit according to claim 1, characterized in that, The low-voltage switchgear copper busbar air-cooling control circuit also includes an intermediate relay and an LED indicator light. The intermediate relay includes a second relay contact and a second coil. The other end of the temperature switch module and the other end of the first relay contact are both connected to the second coil. The other end of the second coil is connected to the neutral wire. The second relay contact is connected to the LED indicator light.

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